# The molar mass of carbon dioxide is 0.045kg/mol. Calculate the density of the gas when the temperature is 273K and the pressure is 120000Pa..?

##### 2 Answers

#### Explanation:

We assume ideality, and we know that

And so

And so

And so we plug in the numbers....

The density is

#### Explanation:

The molar mass of

We can use the **Ideal Gas Law** to determine its density.

#color(blue)(bar(ul(|color(white)(a/a)pV = nRTcolor(white)(a/a)|)))" "#

Since

#pV = (m/M)RT#

We can rearrange this to

#pM = m/VRT#

But

∴

and

#color(brown)(bar(ul(|color(white)(a/a)ρ = (pM)/(RT)color(white)(a/a)|)))" "#

In your problem,

∴